Zeitschriftenaufsatz
Impact of light exposure on fruit composition of white 'Riesling' grape berries (Vitis vinifera L.)
Details zur Publikation
Autorenliste: Friedel M., Stoll M., Patz C.-D., Will F., Dietrich H.
Jahr der Veröffentlichung: 2015
Quelle: Vitis
Bandnummer: 54
Heftnummer: 3
Erste Seite: 107
Letzte Seite: 116
Verlag: Institut Für Rebenzüchtung Geilweilerhof
ISSN: 0042-7500
eISSN: 2367-4156
DOI: 10.5073/vitis.2015.54.107-116
URL: https://ojs.openagrar.de/index.php/VITIS/article/view/5293
Sprachen: Englisch
Peer reviewed
Microclimate and irradiation have long been known to influence winegrape
Abstract
(Vitis vinifera) quality. However, microclimate influence on white
grape quality has remained understudied, as most research efforts have
focused on red varieties and their anthocyanin content. In this study,
we investigated microclimatic effects on the phenolic and amino acid
composition of white 'Riesling' grapes using bunch shading and leaf
removal to manipulate grape microclimate. Both treatments were applied
directly after fruit set (modified E‑L 27; (Coombe 1995)) as well as at
the onset of veraison (E-L 34), and compared to a non-manipulated
control. The concentration of malic acid, amino acids and total nitrogen
were decreased by illumination during the berry growth, while content
and concentration of phenolics were significantly increased by
illumination. Strong negative correlations were observed between
accumulation of amino acids and flavonols. Although accumulation of
flavonols occurred throughout berry development, the most important
phase of accumulation was post-veraison.